Pith Number

pith:XXJ4GH7W

pith:2012:XXJ4GH7WJQOE34ZNF3AMKETMSY

not attested not anchored not stored refs pending

The metallicity profile of M31 from spectroscopy of hundreds of HII regions and PNe

Jonathan McDowell (CfA), Nathan Sanders, Nelson Caldwell, Paul Harding (Case)

arxiv:1209.2251 v1 · 2012-09-11 · astro-ph.CO · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{XXJ4GH7WJQOE34ZNF3AMKETMSY}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T03:10:24.414484Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bdd3c31ff64c1c4df32d2ec0c5126c9602f2c1a0599d55df020b6711eb773375

Aliases

arxiv: 1209.2251 · arxiv_version: 1209.2251v1 · doi: 10.48550/arxiv.1209.2251 · pith_short_12: XXJ4GH7WJQOE · pith_short_16: XXJ4GH7WJQOE34ZN · pith_short_8: XXJ4GH7W

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/XXJ4GH7WJQOE34ZNF3AMKETMSY \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: bdd3c31ff64c1c4df32d2ec0c5126c9602f2c1a0599d55df020b6711eb773375

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7601b8321e741ffe51e1c416a6cde13bf93ec00559aab5bf7cee4cab1af25c2b",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2012-09-11T08:08:46Z",
    "title_canon_sha256": "88f79addf0e3ebf74e453d31509afb22191718305ab8becb1eb707882a9e26ce"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1209.2251",
    "kind": "arxiv",
    "version": 1
  }
}